J.W. Winco Inc. offers EN 5337.9 technopolymer plastic lockable safety five-lobed knobs, with tapped brass insert, in metric sizes. These RoHS-compliant safety five lobed knobs are temperature resistant to 100° C (215° F), as well as resistant to solvents, oils, grease and other chemical agents. To engage and release, the key must be inserted and turned by 180°, creating a formlock between the handle and the tapped insert. Turning the key back by 180° will release the connection. The key can be inserted and pulled off in both end positions, and two keys per knob are included.

The hand knob is made from a special glass-fiber-reinforced technopolymer plastic featuring a black matte finish, with the underside plastic cover ultrasonically welded to the handle body. The tapped insert is brass, molded-in, with a zinc die cast lock mechanism, while the key is brass and nickel plated, with a plastic grip.